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以硅酸钠为硅源,聚苯乙烯与苯乙烯-甲基丙烯酸共聚乳液为模板,制备直径为249～1348nm的不同尺寸的中空二氧化硅微球。在给定二氧化硅与乳液模板质量比的前提下,中空二氧化硅微球直径与壳厚度随着乳液模板直径的增加而增加。中空二氧化硅微球直径与壳厚度也随着二氧化硅与乳液模板质量比的增加而增加。苯乙烯-甲基丙烯酸共聚乳液模板表面存在羧基有利于形成致密、均匀的二氧化硅微球球壳。中空二氧化硅球壳具有介孔结构和大的比表面积。将草甘膦用作释放模型化合物时,其释放速率可通过改变球壳厚度而进行调节。
Using sodium silicate as a silicon source, polystyrene and styrene-methacrylic acid copolymer emulsion as template, hollow silica microspheres with different diameters from 249 to 1348 nm were prepared. Given the mass ratio of silica to the emulsion template, the diameter and shell thickness of the hollow silica microspheres increase as the emulsion template diameter increases. The diameter and shell thickness of hollow silica microspheres also increase with the mass ratio of silica to emulsion template. The presence of carboxyl groups on the surface of the styrene-methacrylic acid copolymer latex template facilitates the formation of a dense, uniform silica microsphere spherical shell. Hollow silica spherical shell with mesoporous structure and large specific surface area. When glyphosate is used as a release model compound, its release rate can be tuned by changing the shell thickness.